regex.c: emacs & glibc (and xemacs, and grep and ...)

[Sam Steingold <sds@gnu.org>]

Emacs comes with it's own version of regex.c, even though most UNIX
systems have a regex implementation.  IIUC, this is for portability.

Suppose glibc's regex and Emacs' regex are unified - will Emacs still
build it's own regex version even on gnu systems (linux, hurd)?

this is probably not a big deal (regex is relatively small) -
but is there a way to detect that the system-supplied regex
(or another, bigger library, e.g., gettext or iconv) is good enough?

Finally, GNU CLISP (http://clisp.cons.org) comes with a GNU regex.c of
1994(!) - which version should we upgrade to?  Emacs?  GLIBC? GNU grep?

thanks.

-- 
Sam Steingold (http://www.podval.org/~sds) running RedHat7.2 GNU/Linux
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